CSS3 multi-column list

I've been using CSS3 multi-column for a few Wordpress sites now and one thing that I find excepteble but still something I want to know how to fix is that if I put a list(with sub items) in the collumns that it won't keep the structure of the list

This is nice because it makes it possible in Wordpress to show menu's like this.
But one thing that bugs me is that it places the Sub-list-items in the next column while the parent of that item is in the previous column.

Is this fixable?

Before anyone says: why don't you just make multiple lists and make your own columns(this was the suggestion when I asked the question how to do this) this is for a dynamic Wordpress menu so I have no controll over how many items are in the menu.